This website uses cookies, which are necessary for the technical operation of the website and are always set. Other cookies, which increase the usability of this website, serve for direct advertising or simplify interaction with other websites and social networks, will only be used with your consent. Read more.


The iM820A is a compact wireless module for the 868 MHz frequency band. Thanks to specific transceiver properties, the iM820A supports low-power applications where permanent wireless availability is required. Its integrated 128-bit AES coprocessor makes this module particularly appropriate for security-related applications. It has a transceiver, microcontroller and an integrated PCB antenna. Of course you can get the module with a 50Ω port for connecting an external antenna. The iM820A can be soldered directly on the target hardware just as usual SMD components. The integration of an RF system in a new or existing product is therefore significant simplified, which reduces development time and costs. With the iM221A, a pin-compatible module for the 2.4 GHz frequency band is available.

Embedded Software:

We also provide software to control the wireless communication and permit the implementation of common use cases. The UART interface connects to a host system via host controller interface (HCI) and allows simple configuration of the wireless and application parameters. Software updates are also made via UART interface using a bootloader already integrated into the module. We offer customizing to special requirements as a service.

WiMOD firmware - standard applications (AppStarterKit):

  • Chat – bi-directional data transfer between two or more modules
  • Radio Link Test – qualitative assessment of the radio link between two modules
  • Remote Control – remote switching of outputs at the remote module
  • Sensor Control – sensor data transmission between two or more modules
  • Sensor Network – sensor network with a central data logge

WiMOD-firmware - sample applications (SampleApps **):

  • Transparent Data Exchange – transparent data channel for cable replacement
  • Remote Control – simple remote control application
  • Range Demo – simple range test

For a fast start-up a Starter Kit is available, with which the functions
and the range of application of the WiMOD module can be evaluated.


  • wireless module for 868 MHz band
  • wake on radio (WOR1) functionallity with low power consumption *
  • RF datarate from 1.2 kbps up to 180 kbps
  • 128-bit AES coprocessor *
  • received signal strength indicator (RSSI2)
  • UART and SPI interface (SPI only on demand)
  • sample applications available
  • software- and pin- compatible with iM221A
  • bootloader functionallity included
  • small footprint, solderable like a SMD component
  • integrated PCB antenna or 50Ω pad
  • RoHS conform

  • Locking systems
  • batterie driven sensor- and actuator- systems
  • remote control
  • building automation
  • Metering
  • ...

Frequency range: 863 MHz to 870 MHz
(902 MHZ to 928 MHz on demand)
(433 MHZ on demand)
Modulation: GFSK, 2-FSK
RF output power: typ. 7 dBm (50Ω pad)
Receiver sensitivity: typ. -110 dBm @ 1 % PER3 1.2 kbps
typ. -94 dBm @ 1 % PER & 180 kbps
RF datarate: 1.2 kbps - 180 kbps
RF range: up to 1100m line of sight
Operating voltage: 2.3 V to 3.6 V (typ. 3.0 V)
Current consumption: typ. 23 mA (receive @ 180 kbps)
typ. 31 mA (transmit @ 7 dBm)
typ. 5 mA (controller active, transceiver off)
typ. 1 µA (power down)
Interfaces: 6 general purpose IOs (analog/digital)
9 digital IOs
  UART, typ. 38.4 kBaud (further on demand)
Dimension (LxWxH): 20 x 25 x 5 mm
Operating temperature: -20°C to +70°C

1 WOR = Wake-On-Radio
2 RSSI = Received Signal Strength Indicator
3 PER = Packet-Error-Rate; packet size = 20 Byte

* This functionality is not part of the standard firmware and only available on demand.
** The sample apps are not supported any more.

Subject to changes without notice.